Propeller.



W. REID.

PROPELLER.

APPLICATION nun) JULY 22, 1910.

1,012,441. Patented Dec. 19, 1911.

WILLIAM REID, OF NEWARK, NEW JERSEY.

PROPELLER.

Specification of Letters Patent.

Patented Dec. 19, 1911.

Application filed July 22, 1910. Serial No. 573,229.

To all whom it may, concern:

Be it known that I, IVILLIAM REID, a citizen of the United States, and aresident of Newark, county of Essex, and State of New Jersey, haveinvented certain new and useful Improvementsin Propellers, of which ithe following is a full, clear, and exact devide a propeller having aplurality of sets of blades having two blades in each set, said bladesextending radially from the hub in diametrically opposite directions andthe blades of the rear set or sets being directly in the rear of theblades of the forward set.

A further object of the invention is to so space the sets of blades thatthose of one set will not interfere with the roper working of those ofthe set next in front, the object being to prevent the rear bladesengaging the water from the forward blades.

With these and other objects in view, the invention will be hereinaftermore particularly described with reference to the accompanying drawings,which form a part of this specification, and will then be pointed out inthe claims at the end of the description.

In the drawings, Figure 1 is a side elevation of the propeller. Fig. 2is a rear view thereof; and Fig. 3 is a view looking at the ends of thepropeller blades.

Referring to the various parts by 1111- merals, 1 designates thepropeller shaft; 2 the propeller hub which carries the propeller blades.To this hub are secured two sets of blades A and B, the blades B beingthe rear blades and the blades A the forward blades. The blades A arearranged radially with respect to the'hub and the longitudinal centerline thereof is perpendicular with respect to the propeller shaft. Theseblades may, of course, be given any desired pitch and may be of anysuitable shape. The blades B are placed a suitable distance in the rearof the blades A and the longitudinal center line of each of said bladesis oblique to the longitudinal center line of the propeller shaft sothat said blades incline rearwardly from the hub. These blades are, ofcourse, arranged at diametrically opposite points as illustrated clearlyin Fig. 2 and are directly in the rear of the blades A, as alsoillustrated clearly in Fig. 2. The purpose of the rearward inclinationof these blades B is to prevent said blades receiving the water from theblades A.

The rear blades are arranged oblique to the longitudinal line of theshaft so that the 1 space between the blades is equal to twice the widthof the blades from the hub up to their place of greatest width. As theblades, shown in the drawings, gradually increase in width from the hubto a point near their outer ends it is necessary to incline the rear setof blades rearwardly in order to maintain said blades from each other adistance equal to twice the width of the blades. It is manifest that ifthe blades were of the same width throughout all points in their lengththey might be arranged parallel. I have found that by so spacing thesets of blades from each other, the desired result is secured and a boatfitted with such a pro- A propeller comprising a hub, and forward andrear sets of blades thereon, the forward set of blades extendingradially outward in opposite directions with their axes perpendicular tothe hubaxis, the rear set of blades being located in alinement with andto the rear of the forward set of blades with their longitudinal axes ina plane passing through the axis of the hub stantially equal to twicethe width of either and sald blades, said rear blades being inblade atthat .point. in

clined rearward relative tothe forward This specification signed andwitnessed blades and spaced from said forward blades this eighteenth dayof July A. D. 1910. 5 in such a manner that the distance between theblades on a line parallel with the axis Witnesses of the shaft is, at:any point Between the JOHN SHEEHAN,

hub and the widest part of the blades, sub- THOMAS MCMAHQN.

WILLIAM. REID. I

